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From the client output provided, it seems you are able to establish a TCP connection and start the protocol negotiation though something is failing at the start of key exchange.
This could happen for a number of reasons but I'd first suggest checking the encryption algos/ciphers supported by the client vs what is configured in the security policy for the server or if you have logging configured for the server but the IAM role is not able to be assumed by the service.
https://docs.aws.amazon.com/transfer/latest/userguide/security-policies.html https://docs.aws.amazon.com/transfer/latest/userguide/monitoring.html#monitoring-enabling
If you are continuing to not be able to connect after this, I would recommend opening a case with support as more information regarding the server and client may be needed to troubleshoot.
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